String
Nature
The underlying nature of String is char[], for example, String str="abc", which is equivalent to char[] arr = {'a','b','c'};
There are two forms of creating objects: String str = "abc", And String str2 = new String("abc");
Common method
- trim: delete the spaces at both ends of the string
- length: Get the length of the string;
- equals: Determine whether the strings are the same, case sensitive;
- equalsIgnorcCase: Determine whether the string length is the same, ignoring case;
- indexOf: Get the position where the specified content appears in the string
- replace: replace
- split cutting
- substring: self-division interception
public class OperationString {
public static void main(String